The crane ultrasonic cool mist humidifier blue drop helps brings relief to congestion day and night and brings moisture into a dry room to help with coughs and sinus irritation the humidifier features a 360 degree multi directional mist nozzle and a whisper quiet operation for silent nights sleep features ultrasonic cool mist increases air moisture for easier breathing and a good nights sleep relieves cough cold and flu symptoms nasal congestion dry cough sinus irritation nose bleeds